| Popis: |
The different kinds of projection type moire topography were compared briefly in this paper. The improved method of preparation and arrangement of gratings were introduced, and the real-time moire equidifference line method was proposed in principle. In addition, the approximate formula of equidifference line in non-telecentric optical path, and the principle and method of reproducing the reference grating were given. Finally, by means of the combination of projection type moire topography and real-time moire method with high-speed photography, the vibration of a thin beam fixedly supported at two ends and the impact deformation of a cantilever beam were recorded. The results of the qualitative analysis and patial quantitative analysis for them have been given. |
